Array Update Operators
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Note
For details on specific operator, including syntax and examples, click on the specific operator to go to its reference page.
Update Operators
Name | Description |
---|---|
$ |
Acts as a placeholder to update the first element that matches the query condition. |
$[] |
Acts as a placeholder to update all elements in an array for the documents that match the query condition. |
$[<identifier>] |
Acts as a placeholder to update all elements that match the arrayFilters condition for the documents that match the query condition. |
$addToSet |
Adds elements to an array only if they do not already exist in the set. |
$pop |
Removes the first or last item of an array. |
$pull |
Removes all array elements that match a specified query. |
$push |
Adds an item to an array. |
$pullAll |
Removes all matching values from an array. |
Update Operator Modifiers
Name | Description |
---|---|
$each |
Modifies the $push and $addToSet operators to append multiple items for array updates. |
$position |
Modifies the $push operator to specify the position in the array to add elements. |
$slice |
Modifies the $push operator to limit the size of updated arrays. |
$sort |
Modifies the $push operator to reorder documents stored in an array. |